annotation

sample

  1. @Retention(RetentionPolicy.SOURCE)
  2. @Target(ElementType.TYPE)
  3. public @interface NewIntent {
  4. }

ElementType

  1. public enum ElementType {
  2.     TYPE, //If you want to annotate class, interface, enum..
  3.     FIELD, //If you want to annotate field (includes enum constants)
  4.     METHOD, //If you want to annotate method
  5.     PARAMETER, //If you want to annotate parameter
  6.     CONSTRUCTOR, //If you want to annotate constructor
  7.     LOCAL_VARIABLE, //..
  8.     ANNOTATION_TYPE, //..
  9.     PACKAGE, //..
  10.     TYPE_PARAMETER, //..(java 8)
  11.     TYPE_USE; //..(java 8)
  13.     private ElementType() {
  14.     }
  15. }

Element

Element represents a program element such as package, class, or methods. We work with elements to read its properties while processing.

  • TypeElement - represents a class or interface
  • VariableElement - represents a field
  • ExecutableElement - It represents a method

RetentionPolicy

  • SOURCE — analyses by compiler and never stored
    • will be removed when the code is compiled
  • CLASS — stored into class file and not retained in runtime
    • will be preserved in the compiled bytecode in addition to the source code
  • RUNTIME — store into class file and usable in runtime(by reflection)